The result of the application of Kelly's (1955) psychology of personal constructs to education is a personal construct model of teaching which reflects itself both in a series of five propositions (based on Kelly's postulates) and a measurement technique, the Tuckman Teacher Feedback Form (TTFF), which is appropriate for determining teacher behavior relative to the model. The propositions are: (1) the teacher relates to the environment by means of personal constructs used for processing incoming information; (2) these consttucts mediate between information the teacher recives and behaviors that he emits; (3) kinds of personal constructs the teacher uses to construe his environment will also be the ones used by an observer to construe the teacher classroom Behaivor; (4) constructs are organized into more stable and meaningful systems or clusters of constructs; and (5) the relative perdominance of construct systems wil reflect the characteristics of the situation, the disposition of the teacher, and the previous history of the teacher. The TTFF is a series of 28 paired adjectives. each paired with its approximate opposite. Each pair presents a personal construct that can be used to construe teacher behavior. It can be used by supervisor, trainned observer, peer, or student to describe teacher behavior over approximately a 45 minute span of time. A copy of the TTFF is included along with scoring information, results of a factor analysis, relaibility and validity data, and research applications. (RC)